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Co-citation, like Bibliographic Coupling, is a semantic similarity measure for documents that makes use of citation relationships. Co-citation is defined as the frequency with which two documents are cited together by other documents.

Co-citation is the presence of two different links, A and B, on a website (C), which means that the value of C will pass through to A and B. Co-citation also goes a step further to dictate that link A and B will form an interrelationship and pass some value by association to one another. Co-citation establishes a relationship between the A and B websites that aren't directly linked together, but do appear together on web page C.

The simultaneous linking to each of a group of webpages from each of another group of webpages, even though the members of the group do not link to each other; used by some search engines to establish a connection between related pages.

Think of it as an ontology, an occurrence. Co-citation refers to the way that the sites are connected to each other. Think of it as a mention, a citation. For example, a high-quality peer-reviewed journal may have dozens of citations due to its authoritative status.

SEO co-citation refers to the symbiosis that occurs when websites discuss interrelated themes, concepts and mention each other. An important aspect of co-citation is the significance (for Google) of the words that surround links.